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renkoumoxing
本文区别于其他传统的人口预测模型,深入分析了当前中国人口的基本情况,以及
最近几年中国人口的发展情况与趋势,针对中国人口基数大、男女比例不协调、乡村人
口城镇化加速、人口老龄化日益严重等显著特点,在各年龄段生育率短期内保持不变的
假设下,建立基本的人口转移回归模型,用于模拟预测短期内中国各类人口数量发展变
化。该模型预测结果显示,中国人口在未来十几年内增长一定幅度后开始下降;与此同
时,人口老龄化、男女比例失调等问题日益严重。该模型短期内的预测效果比较好。
为了使中国将来的人口发展健康、平衡,综合考虑中国以及欧洲一些发达国家和亚
洲一些实行计划生育较早的国家以前以及当前的一些情况,本文提出了修改计划生育政
策的建议。面对日益严重的老龄化现象,我们提出生育率应该参考老龄人口比例这一新
思想,并建立生育率与老龄人口比例的关系模型,用于长期人口的预测。预测结果显示
中国总人口在短期内持续上升,在2025 年到2040 年之间基本保持在14.6 亿的最大值,
然后开始缓慢下降。
两个模型的结果均显示,中国将会面临严重的老龄化和男女比例不协调两个问题。
最后我们提出了适当措施以缓和这两个问题带来的影响。(This is different from other traditional population projection model, in-depth analysis of the current basic situation of China s population, and
In recent years the development of China s population and the trend for China s huge population, gender disharmony, rural people
I accelerated urbanization, the growing aging population and other significant features in the short term fertility of all ages remain unchanged
Assumption, the establishment of basic population transfer regression model, to simulate and predict the short term development of China s various types of population change
Of. The predicted results show that China s population growth in the next decade began to decrease after a certain extent and the same
When an aging population, gender imbalance and other growing problem. The model predicted the short-term results were better.
To make the development of China s future population health, balance, considering China and some developed countries in Europe and A)
- 2010-05-13 11:54:40下载
- 积分:1
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SAPSO
针对粒子群算法存在局部最优,易陷入局部最小值的问题,自适应权重粒子群优化算法(For particle swarm optimization, there are some problems, which are easy to fall into local minimum, and the adaptive weight particle swarm optimization algorithm is easy to fall into local minimum.)
- 2021-01-10 19:18:50下载
- 积分:1
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PLL_Basic
说明: PLL basic modal in simulink
- 2019-07-04 03:39:55下载
- 积分:1
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Digital-filter
设计低通数字滤波器,要求在通带内频率低于 时,允许幅度误差在1dB以内,(Design of digital low pass filter, requirements in the passband frequencies below, allow a margin of error of less than 1dB,)
- 2012-04-20 17:19:11下载
- 积分:1
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Comparetime-frequencydistribution
比较四分量信号的不同时频分布结果,小波分析。(Compare the results of time-frequency distribution of the four components of the signal)
- 2015-03-23 17:06:26下载
- 积分:1
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matlabGUI
这是一个matlabGUI的基本例程,实现了加法器的功能。可用于matlabGUI入门。(This is a basic routine matlabGUI realized adder function. Can be used to matlabGUI started.)
- 2010-12-06 19:41:57下载
- 积分:1
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tx
说明: matlab sdr model works awesome
- 2012-04-12 20:58:50下载
- 积分:1
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equalizer
LS自适应均衡仿真程序,利用矩阵运算实现,程序简洁,有助于学习和理解自适应算法理论(LS adaptive equalization simulation program, using matrix operations to achieve the program simple, to the learning and understanding adaptive algorithm theory)
- 2009-11-17 13:13:43下载
- 积分:1
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OFDM_64QAM_R14
ofdm 64QAM simulink ofdm 64QAM simulink
- 2009-06-23 18:25:24下载
- 积分:1
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ga
说明: 在求解装备的资源约束型装配线一类平衡问题时,借助遗传算法,并对遗传算法进行改进,利用matlab程序进行优化求解。(The type 1 assembling line balancing problem for certain equipment is sovled with modified genetic algorithm by using matlab languge.)
- 2019-04-29 16:27:50下载
- 积分:1